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We present long slit Halpha observations of 50 low surface brightnessgalaxies. Of these, 36 are of sufficient quality to form rotation curves. Thesedata provide a large increase in the number of low surface brightness galaxiesfor which accurate rotation curves are available. They also represent an orderof magnitude improvement in spatial resolution over previous 21 cm studies (1"to 2" instead of 13" to 45"). The improved resolution and accuracy of the dataextend and strengthen the scientific conclusions previously inferred from 21 cmdata.

High-Resolution Rotation Curves of Low Surface Brightness Galaxies. I. Data